This research aimed to determine the most important environment factors affecting morphological distribution of Salvia hydrangea DC. ex Benth in protected region of Tang-e-sayad of Chaharmahal and Bakhtiari Province. This species is one of the medicinal and aromatic plants found in the natural habitats of mountainous areas of the country and contains essential oil of leafs and flowers. To measure morphological characteristics were taken 10 sample of S.hydrangea in each populations (5 plant stands). Leaf, sepal and corolla length and surface, flower stem and panicle inflorescence height and flower number of each panicle inflorescence were studied at the end of the growing season. In each plant populations, 2 soil sampling were executed of two depths 0-15 and 15-30 cm. Some soil parameters including texture, electrical conductivity, acidity, nitrogen, potassium and phosphorus were measured. The average comparison results showed that there was a significant difference between the populations in terms of most traits. PLS analysis results also showed plant height had a positive correlation with apparent specific weight of first depth and had a negative correlation with the soil acidity of first depth. The flowers number in cycle and sepal surface had a positive correlation with slope, gravel, sand and calcium carbonate equivalent (CCE) of second depth. Panicle inflorescence height had a positive correlation with clay, EC and potassium. Leaf length and surface had a positive correlation with slope, sand, CCE and gravel of second depth. The analysis results can determine effective environmental factors on each morphological specification of the species.